CN105864753A - System for recycling high-temperature afterheat of boiler bottom slag of circulating fluid bed and heating hot wind - Google Patents
System for recycling high-temperature afterheat of boiler bottom slag of circulating fluid bed and heating hot wind Download PDFInfo
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- CN105864753A CN105864753A CN201610373995.5A CN201610373995A CN105864753A CN 105864753 A CN105864753 A CN 105864753A CN 201610373995 A CN201610373995 A CN 201610373995A CN 105864753 A CN105864753 A CN 105864753A
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- fused salt
- heat
- air
- slag cooler
- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0472—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being helically or spirally coiled
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a system for recycling high-temperature afterheat of boiler bottom slag of a circulating fluid bed and heating hot wind, belonging to the field of circulating fluid bed boilers. The system comprises a circulating fluid bed boiler, an air preheater at the tail flue gas duct of the circulating fluid bed, a primary and/or secondary air pipeline from the air preheater to the boiler furnace, a fused salt buffer tank, a fused salt pump, at least one fused salt roller slag cooler and an air-fused salt heat exchanger, wherein the air-fused salt heat exchanger is arranged on the primary and/or secondary air pipeline to carry out heat exchange heating on primary and/or secondary air, the at least one fused salt roller slag cooler is used for carrying out heat exchange cooling on bottom slag discharged from the furnace of the circulating fluid bed boiler by using fused salt as coolant, and the fused salt outlet of each fused salt roller slag cooler is communicated with the fused salt inlet of the air-fused salt heat exchanger. The system can increase the temperature of wind entering the furnace by dozens of degrees centigrade on the basis so as to play the effects of saving coal consumption and remarkably improving boiler efficiency; and through the mode, the high-temperature afterheat of CFB boiler bottom slag is effectively reutilized.
Description
Technical field
The invention belongs to CFBB field, particularly relate to the recovery of CFB Slag high-temperature residual heat.
Background technology
The advantage that recirculating fluidized bed (CFB) boiler has fuel tolerance desulfuration in furnace wide, efficient, NOx raw emissions is low,
It is widely used in generating and a lot of industrial circle.CFB boiler deslagging temperature is up to more than 850 DEG C, is high-grade
Waste heat；And to typical high-ash fuel, the physical thermal of deslagging will affect boiler efficiency more than 1%, the Gao Pin of deslagging
Position waste heat has significant recovery value.CFB boiler commonly used water-cooled roller slag cooler at present, utilizes water to cooling height
Temperature lime-ash.The high-temperature residual heat of deslagging becomes the low-grade heat of cooling water, and heat does not obtains effective recycling.
Summary of the invention
It is an object of the invention to: for the problems referred to above, the present invention proposes a kind of with fused salt at the bottom of heat-transfer working medium recovery CFB boiler
Slag high-temperature residual heat is also used for heating the system of hot blast.With typical NaNO3-KNO3As a example by Molten Binary Salts, operating temperature is significantly larger than
Cooling water, can reach 600 DEG C, and its stable in properties, is not easily decomposed, works at ambient pressure.When system is run, CFB
Boiler slag removal is introduced into fused salt roller slag cooler, fused salt absorb a part of high temperature bottom slag heat.After absorbing the intensification of bottom ash waste heat
Temperature of molten salt can reach about 500 DEG C, the high-grade of energy can be maintained, in order to heat the hot blast of about 290 DEG C, can make into
The pathogenic wind-warm entering burner hearth improves tens degrees Celsius on this basis, the effect play and save coal consumption, significantly improving boiler efficiency.Logical
Crossing this mode, CFB boiler bottom ash high-temperature residual heat is recovered efficiently utilization.
The object of the invention is realized by following technical proposals:
A kind of system reclaiming CFB Slag high-temperature residual heat and heating hot blast, including CFBB and tail thereof
The air preheater of portion's flue, and air preheater is to one and/or secondary wind pipeline of boiler furnace, also includes that fused salt buffers
Tank, pump for liquid salts, fused salt roller slag cooler and air-fused salt heat exchanging device, air-fused salt heat exchanging device is located at one and/or secondary air channel
On road, one and/or secondary wind being carried out heat exchange intensification, fused salt roller slag cooler is at least one, for fused salt as bosher
The bottom ash that confrontation boiler hearth of circulating fluidized bed is discharged carries out heat exchange cooling, the deslagging entrance of each fused salt roller slag cooler and circulation
Fluid bed boiler furnace slag-drip opening connects, and the fused salt outlet of fused salt surge tank is through the fused salt of pump for liquid salts Yu each fused salt roller slag cooler
Entrance connects, and the fused salt outlet of each fused salt roller slag cooler connects with the fused salt entrance of air-fused salt heat exchanging device, air-fused salt
The fused salt outlet of heat exchanger connects with the fused salt entrance of fused salt surge tank.
As selection, also include at least one water cooling roller slag cooler, for fused salt roller slag cooler being arranged with water for cooling working medium
The bottom ash gone out carries out heat exchange cooling, the most respective row with each fused salt roller slag cooler of the deslagging entrance of each water cooling roller slag cooler
Slag outlet.
As selection, fused salt is Molten Binary Salts, ternary molten salt, nitrate or carbonate etc..
As selection, the cylinder barrel of fused salt roller slag cooler is formed by some heat exchanger tube coiled coils, is connected by band steel between pipe,
Form membrane wall barrel；At drums inside, by inner wall of rotary drum, radially arrange some heat exchanger tubes, form membrane wall
Tube panel, and membrane panel along cylinder axially inner wall of rotary drum coiled coil formed conduit.
As selection, air-fused salt heat exchanging device uses the structure of tube-type air preheater, and fused salt is vertical direction flowing in heat exchange tube,
Air is at the outer cross-flow tube bank of heat exchange tube.As selection, heat exchanger tube stagger arrangement is arranged.
Aforementioned main formula case of the present invention and each further selection scheme thereof can be with independent assortment to form multiple schemes, and being the present invention can
The scheme using and claiming；And the present invention, (each non conflicting selection) select between and and other select between can appoint
Meaning combination.Those skilled in the art can understand there is multiple combination according to prior art and common knowledge after understanding the present invention program,
It is the claimed technical scheme of the present invention, does not do at this exhaustive.
Work process is: (fused salt cylinder is cold to enter the roller slag cooler with fused salt as cooling working medium from the high temperature bottom slag of burner hearth discharge
Slag device), discharge after being cooled to uniform temperature by fused salt in fused salt roller slag cooler, (such as, enter one carrying out subsequent treatment
Stepping enters water cooling roller slag cooler heat exchange cooling)；After fused salt absorbs bottom ash heat, temperature raises, and then enters air-fused salt and changes
Hot device, Bottomhole pressure and heat from air preheater outlet hot blast, after heat exchange, temperature of molten salt declines again, through fused salt
Surge tank, is extracted out entrance fused salt roller slag cooler by pump for liquid salts and completes the circulation in fused salt loop.Hot blast is at air-fused salt heat exchanging device
Middle horizontal plunder fused salt tube bank, heated by fused salt, temperature rise, the hot blast after intensification enters back into burner hearth, can efficient recovery heat,
Save coal consumption, improve boiler efficiency.It is pointed out that the hot blast that fused salt heats can be First air, it is also possible to be secondary
Wind.
Fused salt roller slag cooler in the present invention uses fused salt to absorb lime-ash heat as heat transfer medium, and cylinder barrel is by heat exchanger tube dish
Around forming, connected by band steel between pipe, the membrane wall barrel being i.e. coiled to form.At drums inside, along footpath by inner wall of rotary drum
Arranging heat exchanger tube to direction, form the little tube panel of membrane wall, little tube panel axially coils at cylinder spiral inner wall along cylinder.On the one hand can
To become the lime-ash conduit along cylinder axially-movable, on the one hand inside slag cooler, add heating surface, slag cooler overall heat exchange
Ability is strengthened.
Air in the present invention-fused salt heat exchanging device uses the structure of tube-type air preheater, and fused salt is vertical direction flowing, hot blast in pipe
Manage outer cross-flow tube bank.Heat exchanger tube stagger arrangement is arranged.
Beneficial effects of the present invention: use this to design, can be with the high-temperature residual heat of effective recycling CFB boiler bottom ash.Utilize molten
Salt absorbs heat, and high-grade heat can be made to be utilized effectively；Heating one/secondary wind, can improve hot blast temperature, effectively save coal
Consumption, raising boiler efficiency, bring considerable economic well-being of workers and staff.
Accompanying drawing explanation
Fig. 1 is the device schematic flow sheet of the embodiment of the present invention 1；
Fig. 2 is the device schematic flow sheet of the embodiment of the present invention 2；
Fig. 3 is the arrangement states schematic diagram of the fused salt roller slag cooler of the embodiment of the present invention 2；
Wherein 1-boiler body, 2-fused salt roller slag cooler, 3-water cooling roller slag cooler, 4-low-temperature molten salt pump, 5-low temperature melts
Salt buffer tank, 6-air-fused salt heat exchanging device, 7-air preheater.
Fig. 4 is the facade structures schematic diagram of the embodiment of the present invention 3；
Fig. 5 is the cross-sectional configuration schematic diagram of the embodiment of the present invention 3；
Wherein 1-swivel joint, 2-end cap, 3-dust cover and slag notch, 4-annular header, 5-connection member, 6-slag input fills
Put, 7-base, end bearing after 8-, 9-sprocket wheel, 10-reductor, 11-motor, end bearing before 12-, 13-barrel spiral
Coiling heat exchanger tube, 14-inner core membrane wall little tube panel heat exchanger tube, 15-longitudinal baffle, 16-support ring, 17-barrel coiled coil
Heat exchanger tube band steel, 18-inner core membrane wall little tube panel band steel.
Detailed description of the invention
Following non-limiting examples is used for the present invention is described.
Embodiment 1:
With reference to shown in Fig. 1, in figure, multistage dotted line represents lime-ash flow process, and solid line represents that fused salt flow process, dot-dash dotted line represent one/bis-
Secondary wind.A kind of system reclaiming CFB Slag high-temperature residual heat and heating hot blast, including CFBB and
The air preheater 7 of its back-end ductwork, and the one of air preheater 7 to boiler body 1 burner hearth and/or secondary wind pipeline,
Also include low-temperature molten salt surge tank 5, low-temperature molten salt pump 4, fused salt roller slag cooler 2 and air-fused salt heat exchanging device 6, air-
Fused salt heat exchanging device 6 be located at one and/or secondary wind pipeline on one and/or secondary wind are carried out heat exchange intensification, fused salt drum slag cooling
Device 2 at least one, changes for the bottom ash discharged circulating fluid bed boiler body 1 burner hearth for cooling working medium with fused salt
Heat drop temperature, the deslagging entrance of each fused salt roller slag cooler 2 connects with circulating fluid bed boiler body 1 burner hearth slag-drip opening, low temperature
The fused salt outlet of fused salt surge tank 5 connects through the fused salt entrance of low-temperature molten salt pump 4 with each fused salt roller slag cooler 2, each fused salt
The fused salt outlet of roller slag cooler 2 connects with the fused salt entrance of air-fused salt heat exchanging device 6, melting of air-fused salt heat exchanging device 6
Salt outlet connects with the fused salt entrance of low-temperature molten salt surge tank 5.Fused salt is Molten Binary Salts, ternary molten salt, nitrate or carbonic acid
Salt etc., fused salt circulates in systems as heat catalysis, low-temperature molten salt pump 4 provide power.Fused salt roller slag cooler 2
Cylinder barrel formed by some heat exchanger tube coiled coils, connected by band steel between pipe, formed membrane wall barrel；At drums inside,
By inner wall of rotary drum, radially arrange some heat exchanger tubes, form membrane panel, and membrane panel is axial along cylinder
Conduit is formed at inner wall of rotary drum coiled coil.Air-fused salt heat exchanging device 6 uses the structure of tube-type air preheater, and fused salt is at heat exchanger tube
Vertical direction flowing in pipe, air is at the outer cross-flow tube bank of heat exchange tube, and heat exchanger tube stagger arrangement is arranged.
Before startup, in electrically heated mode fused salt melted in low-temperature molten salt surge tank 5 and be heated to above work temperature
Degree so that it is temperature has certain nargin, to avoid it to solidify after entering fused salt roller slag cooler 2, to it also avoid right simultaneously
The heating of fused salt roller slag cooler 2 itself, it is not necessary to heating wire etc. is set, simplifies fused salt roller slag cooler 2 structure, also make
The maintenance of equipment more easily operates.
After equipment is stopped transport, for accumulating the fused salt in fused salt roller slag cooler 2 cylinder bottom, pressure air or steam can be used to blow
The mode swept empties.
Embodiment 2:
With reference to Fig. 2, shown in 3, in Fig. 2, multistage dotted line represents lime-ash flow process, and solid line represents that fused salt flow process, dot-dash dotted line represent
One/secondary wind, pecked line represents cooling water flow path.The present embodiment is substantially the same manner as Example 1, and its difference is: also include
At least one water cooling roller slag cooler 3, carries out heat exchange for the bottom ash discharged fused salt roller slag cooler 2 for cooling working medium with water
Cooling, the most respective deslagging outlet with each fused salt roller slag cooler 2 of the deslagging entrance of each water cooling roller slag cooler 3.
Specifically: this system is melted by CFB boiler body 1, fused salt roller slag cooler 2, water cooling roller slag cooler 3, low temperature
Salt pump 4, low-temperature molten salt surge tank 5, air-fused salt heat exchanging device 6 and air preheater 7 form.Fused salt is as heat catalysis
Circulate in systems, low-temperature molten salt pump 4 provide power.As shown in accompanying drawing 2, accompanying drawing 3, have four fused salt cylinders
Slag cooler 2, is installed in the position of slightly less than boiler body 1 burner hearth slag-drip opening, is distributed in boiler body 1 burner hearth surrounding, and
And every fused salt roller slag cooler 2 is connected with a water cooling roller slag cooler 3 respectively.Low-temperature molten salt pump 4 provides power, will
Four fused salt cylinder heat exchangers 2 of low-temperature molten salt suction.High-temperature molten salt heat release in air-fused salt heat exchanging device 6 is heated from air
The hot blast of preheater 7 outlet.Low temperature buffer tank 5 plays buffering, the effect of protection.
Concrete, the high-temperature ash (860 DEG C, 114.3t/h) discharged from burner hearth 1 is divided into four parts, respectively enters four and melts
Salt roller slag cooler 2；In fused salt slag cooler 2, lime-ash enters rear end water-cooled slag cooler 3 after being cooled to 400 DEG C by fused salt and continues
Continue and be cooled directly with water to less than 150 DEG C discharges (can as little as 90 DEG C, water correspondence is warming up to 70 DEG C from 30 DEG C).Every cold slag of fused salt
Flow rate of molten salt in device 2 is about 13.69kg/s, fused salt inlet temperature 310 DEG C；Fused salt absorbs the heat of lime-ash release, temperature
Being risen to 500 DEG C by 310 DEG C, after completing heat absorption, the fused salt in four fused salt slag coolers 2 collects entrance air-fused salt heat exchanging
Device 6, Bottomhole pressure and heat from air preheater 7 outlet hot blast, after heat release, temperature of molten salt drops to 310 DEG C again,
Then flow through low temperature buffer tank 5, and extracted out by low-temperature molten salt pump 4, reenter fused salt slag cooler 2 and complete following of fused salt loop
Ring.Hot blast is horizontal in air-fused salt heat exchanging device 6 plunders fused salt tube bank, is heated by fused salt, and temperature is risen to 362 DEG C by 298 DEG C
(First air) or 345 DEG C (secondary wind), the hot blast after intensification enters back into burner hearth 1, can efficient recovery heat, improve boiler
Efficiency.
This programme design fused salt is Molten Binary Salts (60%NaNO3+ 40%KNO3), calculate through design, outside fused salt roller slag cooler cylinder
Footpath 2.22m, import is to exporting long 9.4m, and heat exchanger tube specification is 38 × 4mm.Inner core helical tube panel heat exchanger tube radical 7,
Band steel width 8mm between pipe, tube panel height 332mm, screw pitch 20mm.Cylinder outer wall coil pipe radical 4, single heat exchange tube
The coiling number of turns 51 is enclosed.Fused salt flowing drag overall 0.57MPa, flow rate of molten salt 13.688kg/s, fused salt flow velocity 1m/s in slag cooler.
Slag cooler total heat conduction area 293.20m2。
Air-fused salt heat exchanging device heat exchanger tube specification 42 × 2mm, Transverse tube pitch 63m, longitudinal pipe spacing 42mm, flow rate of molten salt
54.033kg/s, fused salt flow velocity 2m/s；Air mean flow rate 7m/s.Heat-exchanging tube bundle total height 8m, bank of tubes total length 3.822m,
Bank of tubes overall width 2.3415m, the total radical of heat exchanger tube 3367, total heat exchange area 3554m2。
Concrete, to a 600MWCFB boiler, calculating through design, needed for separate unit fused salt roller slag cooler, steel material is about
11.2t, uses 15GrMoG to manufacture, calculates by 20,000 yuan/t, and separate unit fused salt slag cooler body cost is about 22.40 ten thousand yuan；
Air-fused salt heat exchanging device consumptive material 53.15t, heat exchanger body cost is about 106.30 ten thousand yuan；Low-temperature molten salt pump through inquiry is
13.95 ten thousand yuan；Adding the consumables costs such as low temperature buffer tank, flue, steel construction, equipment gross investment is about 343.182 ten thousand yuan.
Meanwhile, power plant's year hours of operation is pressed 5000h and is calculated, and the year of increase is run power consumption and is computed about 14.4 ten thousand yuan.And it is sharp
With bottom ash waste heat improve that hot blast temperature brought year coal conservation about at about 15600t, 4,700,000 yuan of left sides of coal-fired investment can be saved
Right.So, the investment payback time is about 0.75.The income brought by economizing on coal every year afterwards, at about 4,700,000 yuan, removes
Annual power consumption about 140,000 yuan, is calculated by power plant's service life, has preferable economic well-being of workers and staff for 20 years.
Embodiment 3:
With reference to Fig. 4, shown in 5, the preferred fused salt roller slag cooler of previous embodiment 1,2, including drive mechanism, and passes through
Drive mechanism drives the cylinder rotated around central shaft, also includes the supporting mechanism supporting cylinder.Cylinder barrel is by some heat exchanger tubes
(barrel coiled coil heat exchanger tube 13) is closely coiled to form along cylinder axial screw, and between pipe, by band steel, (barrel coiled coil changes
Heat pipe band steel 17) connect, form membrane wall barrel；At drums inside, radially arrange some by inner wall of rotary drum
Heat exchanger tube (inner core membrane wall little tube panel heat exchanger tube 14), is connected by band steel (inner core membrane wall little tube panel band steel 18) between pipe,
Form membrane panel, and membrane panel axially forms conduit at inner wall of rotary drum coiled coil along cylinder；Cylinder import and going out
Mouth is respectively arranged with an annular header 4, with heat exchanger tube (barrel coiled coil heat exchanger tube 13) and the membrane panel of membrane wall barrel
Heat exchanger tube (inner core membrane wall little tube panel heat exchanger tube 14) connect.
As selection, as shown in this embodiment, in cylinder between adjacent two pitches of the spiral channel that membrane panel is formed,
Circumferentially spaced on inner wall of rotary drum arranging some longitudinal baffles 15, longitudinal baffle 15 axially and radially prolongs along cylinder simultaneously
Stretch, and also towards peripheral, oblique while court radially extends, incline direction is contrary with cylinder direction of rotation (sees Fig. 2, longitudinally
Baffle plate 15 circumferentially counterclockwise tilts, and cylinder is rotated clockwise).
As selection, cylinder one end open is slag input end, and other end opening is slag output end, and the slag input end of cylinder is provided with slag feeding device
6, the slag output end of cylinder is provided with dust cover and slag notch 3.
As selection, drive mechanism includes the sprocket wheel 9 of wound drum stack shell, and electronic around central shaft rotation of band movable sprocket 9
Machine 11 and reductor 10 thereof.
As selection, supporting mechanism includes base 7, front end bearing 12, rear end bearing 8 and bracing ring 16, and front and back ends props up
Holding 12,8 and be respectively arranged on base 7 and be positioned at cylinder front and rear portions, bracing ring 16 wound drum stack shell also supports fixing respectively
In front and back ends supporting 12,8.
As selection, the two ends of cylinder further respectively have swivel joint 1.
Specifically, as example, a kind of roller slag cooler structure with fused salt as cooling medium, critical piece includes: 1-
Swivel joint, 2-end cap, 3-dust cover and slag notch, 4-annular header, 5-connection member, 6-slag feeding device, 7-base,
End bearing after 8-, 9-sprocket wheel, 10-reductor, 11-electromotor, end bearing after 12-, 13-barrel coiled coil heat exchanger tube,
14-inner core membrane wall little tube panel heat exchanger tube, 15-longitudinal baffle, 16-support ring, 17-barrel coiled coil heat exchanger tube band steel,
18-inner core membrane wall little tube panel band steel.
Cylinder wall is formed by many heat exchanger tubes (barrel coiled coil heat exchanger tube 13) coiled coil, with band steel (cylinder between adjacent tubes
Wall coiled coil heat exchanger tube band steel 17) connect；If pipe number is more, then can be grouped in cylinder import, be evenly distributed on rolling
Cylinder import circumference on, then carry out compact disc around.
Drums inside, starts to arrange many heat exchanger tubes (inner core membrane wall little tube panel heat exchanger tube along cylinder radial direction from inner tube wall
14), being connected by band steel (inner core membrane wall little tube panel band steel 18) between pipe, form the little tube panel of membrane wall, little tube panel is along drum shaft
Conduit is become at cylinder spiral inner wall winding escalator, the path on the one hand pushed forward as lime-ash, on the one hand increase internal heating surface,
Improve slag cooler exchange capability of heat；In this programme, the specification of each heat exchanger tube of the little tube panel of spiral membrane wall is identical.
In slag cooler, all heat exchanger tube transfer working medium in heat are high-temperature molten salt.
Cylinder entrance point and the port of export are respectively provided with a swivel joint 1.
Cylinder inlet and outlet is respectively arranged with an annular header 4, with barrel coiled coil heat exchanger tube 13 and the little tube panel of inner core membrane wall
Heat exchanger tube 14 connects.
This patent uses coil membrane wall, to reduce the parallel transistor daughter root number of fused salt circulation, thus reduces flow area
Long-pending, it is ensured that fused salt flow velocity.
On the other hand, this patent inner barrel arranges the little tube panel of membrane wall, and working medium uses fused salt, and heat transfer temperature difference reduces, and is not increasing
Under conditions of big equipment volume, it is internally formed more heating surface at roller slag cooler, to ensure enough heat exchange amounts.
Additionally, the spiral channel that little tube panel is formed can also become the lime-ash path along cylinder axially-movable, play promotion lime-ash and exist
The effect transported in cylinder.
Arrange some longitudinal baffles 15 between adjacent two pitches of cylinder internal coiling conduit, play reinforcement bottom ash disturbance, strengthening
The effect of heat transfer.
Concrete, to a 600MWCFB boiler, bed drain purge 114.3t/h, every fused salt heat exchanging device is exerted oneself 30t/h.Through design
Calculate, use typical Molten Binary Salts (60%NaNO3+ 40%KNO3), fused salt roller slag cooler cylinder external diameter 2.22m, import is arrived
Exporting long 9.4m, heat exchanger tube specification is 38 × 4mm.Inner core helical tube panel heat exchanger tube radical 7, band steel width 8mm between pipe,
Thick 6mm, tube panel height 332mm, screw pitch 20mm, the spiral number of turns 47 is enclosed.Cylinder outer wall coil pipe radical 4, pipe
Between band steel width 8mm, thick 10mm, the single heat exchange tube coiling number of turns 51 is enclosed.Fused salt flowing drag overall 0.57MPa in slag cooler,
Flow rate of molten salt 13.688kg/s, fused salt flow velocity 1m/s in pipe.Slag cooler total heat conduction area 293.20m2.It is computed, if this is cold
Slag device accesses design system heating hot blast, can save coal consumption about 15600t every year, can save coal-fired investment about 4,700,000 yuan.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and former
Any amendment, equivalent and the improvement etc. made within then, should be included within the scope of the present invention.
Claims (6)
1. reclaim CFB Slag high-temperature residual heat and heat a system for hot blast, including CFBB and afterbody thereof
The air preheater of flue, and air preheater is to one and/or secondary wind pipeline of boiler furnace, it is characterised in that: also include
Fused salt surge tank, pump for liquid salts, fused salt roller slag cooler and air-fused salt heat exchanging device, air-fused salt heat exchanging device is located at one and/or two
On secondary air pipe line, one and/or secondary wind being carried out heat exchange intensification, fused salt roller slag cooler is at least one, and it is cold for being used for fused salt
But the bottom ash that boiler hearth of circulating fluidized bed is discharged by working medium carries out heat exchange cooling, the deslagging entrance of each fused salt roller slag cooler with follow
Ring fluid bed boiler furnace slag-drip opening connects, and the fused salt outlet of fused salt surge tank is through the fused salt of pump for liquid salts Yu each fused salt roller slag cooler
Entrance connects, and the fused salt outlet of each fused salt roller slag cooler connects with the fused salt entrance of air-fused salt heat exchanging device, and air-fused salt changes
The fused salt outlet of hot device connects with the fused salt entrance of fused salt surge tank.
2. the system reclaiming CFB Slag high-temperature residual heat and heating hot blast as claimed in claim 1, it is characterised in that:
Also include at least one water cooling roller slag cooler, change for the bottom ash for cooling working medium, fused salt roller slag cooler discharged with water
Heat drop temperature, the most respective deslagging outlet with each fused salt roller slag cooler of the deslagging entrance of each water cooling roller slag cooler.
3. the system reclaiming CFB Slag high-temperature residual heat and heating hot blast as claimed in claim 1, it is characterised in that:
Fused salt is Molten Binary Salts, ternary molten salt, nitrate or carbonate.
4. the system reclaiming CFB Slag high-temperature residual heat and heating hot blast as claimed in claim 1, it is characterised in that:
The cylinder barrel of fused salt roller slag cooler is formed by some heat exchanger tube coiled coils, is connected by band steel between pipe, forms membrane wall barrel；
At drums inside, by inner wall of rotary drum, radially arrange some heat exchanger tubes, form membrane panel, and membrane panel
Axially conduit is formed at inner wall of rotary drum coiled coil along cylinder.
5. the system reclaiming CFB Slag high-temperature residual heat and heating hot blast as claimed in claim 1, it is characterised in that:
Air-fused salt heat exchanging device uses the structure of tube-type air preheater, and fused salt is vertical direction flowing in heat exchange tube, and air is at heat exchange tube
Outer cross-flow tube bank.
6. the system reclaiming CFB Slag high-temperature residual heat and heating hot blast as claimed in claim 5, it is characterised in that:
Heat exchanger tube stagger arrangement is arranged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610373995.5A CN105864753B (en) | 2016-05-30 | 2016-05-30 | A kind of system for reclaiming CFB Slag high-temperature residual heat and heating hot blast |
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| CN201610373995.5A CN105864753B (en) | 2016-05-30 | 2016-05-30 | A kind of system for reclaiming CFB Slag high-temperature residual heat and heating hot blast |
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| CN105864753B CN105864753B (en) | 2018-01-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107013906A (en) * | 2017-04-13 | 2017-08-04 | 重庆大学 | A kind of CFB Slag waste-heat recovery device |
| CN108266791A (en) * | 2016-12-30 | 2018-07-10 | 百吉瑞（天津）新能源有限公司 | A kind of molten salt energy-storage and electric boiler complementation heating system |
-
2016
- 2016-05-30 CN CN201610373995.5A patent/CN105864753B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108266791A (en) * | 2016-12-30 | 2018-07-10 | 百吉瑞（天津）新能源有限公司 | A kind of molten salt energy-storage and electric boiler complementation heating system |
| CN107013906A (en) * | 2017-04-13 | 2017-08-04 | 重庆大学 | A kind of CFB Slag waste-heat recovery device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105864753B (en) | 2018-01-09 |
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